PHP - JSONObject class.

gistfile1.php

class JSONObject extends stdClass {

	// Accepts an array, object, or JSON encoded string.
	public function __construct( $o=null ) {
		if( $o === null ) {
			return;
		}
		if( is_string( $o ) ) {
			$o = json_decode( $o );
		}
		if( is_object( $o ) || is_array( $o ) ) {
			$this->cast( $o );
		}
	}

	// When this object is cast to a string, a JSON encoded string is returned.
	public function __toString() {
		return json_encode( $this );
	}

	// Returns NULL when an unset property is accessed.
	public function __get( $name ) {
		if( isset( $this->$name ) ) {
			return $this->$name;
		}
		return null;
	}

	// For internal use, maps/casts an array or object to this object.
	private function cast( $o ) {
		foreach( $o as $k => $v ) {
			if( is_object( $v ) ) {
				$this->$k = new JSONObject( $v );
				continue;
			}
			$this->$k = $v;
		}
	}

}

// BASIC EXAMPLE OF USE //

$o1 = new JSONObject();
$o1->apple  = 'green';
$o1->banana = 'yellow';

echo $o1; // output: {"apple":"green","banana":"yellow"}

$o2 = new JSONObject( '{"apple":"green","banana":"yellow"}' );

echo $o2->apple;  // output: green
echo $o2->banana; // output: yellow